Logs & console
The Logs view (in the menu, admins only) shows the server log.

Reading the logs
Logs stream live. Filter by source (All, a system component such as Server, go2rtc, nats, tunnel, a camera or a plugin), search the visible lines, or download, copy all or delete the log.
Console
The Console (in the menu, available to every user) shows the log of the app itself, not the server: the place to look when a view stays empty, a stream won't play or a button does nothing.
It only collects entries while Record logs is on, in Settings → Appearance. The same section has Verbose logging, which adds debug-level entries.
The Levels menu filters by Debug, Log, Info, Warning and Error. Export / share saves the output as a text file.
For problems with the app, the Console export is the useful thing to attach. For problems with the server, the Logs download.
Terminal
There's also a Terminal in the menu, an interactive shell on the server for advanced troubleshooting. It's available on server installations, not in the desktop app.